Boost your 2011–2016 LML Duramax’s reliability and fueling capability with a Fleece Performance CP3 conversion kit. The factory CP4 pump is known for costly failures that can wipe out your entire fuel system. By converting to the proven CP3, you’ll avoid expensive repairs and enjoy better performance and peace of mind.

Each Fleece kit features OEM-quality molded fuel feed and return hoses, high-flow CP3 fuel fittings, and a valley feed line to support aftermarket lift pump setups. The conversion is fully 50-state compliant (EO# D-834-1) and designed for a true OE fit-and-finish.

FPE-LML-CP3-NP ("No Pump" Kit):

Includes all hardware needed to adapt an LBZ/LMM Bosch CP3 (not included) to your LML. Perfect for those who want to choose their own pump.

FPE-LML-CP3-WP ("With Pump" Kit):

Comes with a brand new LBZ/LMM Bosch CP3 and all required hardware. Designed for use with or without a low pressure lift pump (keep feed pressure to CP3 at or below 11 psi for best results).

FPE-LML-CP3-10 (Heavy Duty 10mm Stroker Kit):

Features a new LBZ/LMM Bosch CP3 with a Fleece 10mm stroker cam for maximum fueling. Includes all hardware. Compatible with or without a low pressure lift pump (keep feed pressure at or below 2 psi to avoid surging; higher pressures may require FCA table adjustments).

Kit Contents (all kits):

CP3 to rail high pressure fuel line
High flow CP3 feed & return fittings
Preformed fuel feed & return hoses
CP3 mounting adapter
Dosing injector distribution block, feed & return lines
FCA extension harness
Low pressure fuel feed line
Hardware kit

Application Notes:

• No FCA regulator table changes are required when converting from the CP4 to a stock CP3 when using this kit.